摘要
对加氢反应器材料2.25Cr-1Mo合金钢在146.67 MPa的作用应力下,进行了468℃×200h的等温回火脆化试验。根据加氢反应器母材试块有应力及无应力两种状态的冲击功和温度关系曲线,求出两种状态回火脆性转变温度值vTr54.2和50%断口纤维率值FATT。对试块断口进行扫描电镜分析,有无应力作用下的脆化态母材断口形貌皆为解理+韧窝状形貌,表现为穿晶断裂。研究结果表明,导致材料回火脆化的主要因素是温度和等温时间,而作用应力对2.25Cr-1Mo钢回火脆性的影响不显著。
The isothermal tempering embrittlement test of 2.25 Cr - 1 Mo alloy steel for hydrogenation reactor with 146.67 MPa applied stress at 468 ℃ for 200 h has been carried out. Based on the relation curves of temperature and iMPact energy of base metal sample of hydrogenation reactor with applied stress and without stress, the temper embrittlement transition temperature vTr54.2 value and 50% percent ductile fracture value FATT. SEM analysis revealed that the base metal fracture surface mainly consisted of cleavage and dimple fracture at two states, and transcrystalline fracture was also obtained. The results from this paper showed that primary factors led to material embrittlement were temperature and isothermal time while the influence of applied stress on temper embrittlement of 2.25 Cr - 1Mo steel was not remarkable.
出处
《压力容器》
北大核心
2009年第11期21-24,49,共5页
Pressure Vessel Technology
关键词
加氢反应器
作用应力
回火脆化
微观组织
hydrogenation reactor
applied stress
temper embrittlement
microstructure
